초록 ▼

A magnetic bearing apparatus comprises a first magnetic bearing for levitating a rotary body by magnetic attraction forces in an axial direction thereof and a second magnetic bearing for levitating the rotary body by magnetic attraction forces in a radial direction thereof. A first detecting device

A magnetic bearing apparatus comprises a first magnetic bearing for levitating a rotary body by magnetic attraction forces in an axial direction thereof and a second magnetic bearing for levitating the rotary body by magnetic attraction forces in a radial direction thereof. A first detecting device detects axial displacement of the rotary body and outputs a first detection signal corresponding to the detected axial displacement of the rotary body. A second detecting device detects radial displacement of the rotary body and outputs second detection signals corresponding to the detected radial displacement of the rotary body. A first A/D conversion device converts the first detection signal to a first digital signal at a first conversion speed. A second A/D conversion device converts the second detection signals to second digital signals at a second conversion speed different from the first conversion speed. A calculating device calculates control currents on the basis of the first and second digital signals for controlling the axial and radial direction electromagnets to levitate the rotor in the axial and radial directions at a preselected target position.

대표청구항 ▼

[ I claim:] [1.] A magnetic bearing apparatus comprising:a rotor;a radial direction electromagnet for magnetically supporting the rotor in a radial direction;an axial direction electromagnet for magnetically supporting the rotor in an axial direction;axial direction shift detecting means for detecti

[ I claim:] [1.] A magnetic bearing apparatus comprising:a rotor;a radial direction electromagnet for magnetically supporting the rotor in a radial direction;an axial direction electromagnet for magnetically supporting the rotor in an axial direction;axial direction shift detecting means for detecting a shift of the rotor in the axial direction;radial direction shift detecting means for detecting a shift of the rotor in the radial direction;axial direction A/D conversion means for A/D converting at a first conversion speed a shift signal corresponding to the shift of the rotor in the axial direction detected by the axial direction shift detecting means;radial direction A/D conversion means for A/D converting at a second conversion speed a shift signal corresponding to the shift of the rotor in the radial direction detected by the radial direction shift detecting means, the second conversion speed being different from the first conversion speed; andcalculation means for calculating control currents in accordance with a predetermined calculation on the basis of the shift signals subjected to A/D conversion by the axial direction A/D conversion means and the radial direction A/D conversion means for controlling the axial and radial direction electromagnets to magnetically support the rotor in the axial and radial directions at a preselected target position.